London Underground trains come in two sizes, larger sub-surface trains and smaller deep-tube trains. Since the early 1960s all passenger trains have been electric multiple units (EMUs) with sliding doors.
Are underground lines electric?
In civil engineering, undergrounding is the replacement of overhead cables providing electrical power or telecommunications, with underground cables.
When was London Underground electrified?
The first deep-level tube line, the City and South London Railway, opened in 1890 with electric trains.
Is the London Tube electric?
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